doc: add installation instructions

Author: uditkarode

README.md

@@ -20,12 +20,5 @@ sudo -E diamond --start-all
 
 and allows checking their status using `sudo -E diamond --list`.
 
-# Downloads  
-## arm64
-**Linux**: https://nightly.link/uditkarode/diamond/workflows/arm64/master/diamond-arm64.zip  
-
-## x86_64
-**Linux**: https://nightly.link/uditkarode/diamond/workflows/x86_64/master/diamond-Linux.zip  
-
-> NOTE: untested on macOS  
-**macOS**: https://nightly.link/uditkarode/diamond/workflows/x86_64/master/diamond-macOS.zip
+# Installation  
+Download the latest [release](https://github.com/uditkarode/diamond/releases), make it executable, and move it to `/usr/local/bin` (or any other location in `PATH`) for easier access.